If you need to get the 10 first (order by something?) for X amount of facets, I don't think there is a way to do it in a single query.However, you could use multisearch to limit the number of queries. Here's an example:

So I gave it a try and it works. Feels a bit dirty though.. :) A question though. If I add 10 searches to a multisearch, I get 403 forbidden, saying that 10 is the maximum allowed queries. If I only add 9 queries it works. Is this by design? Or just a misstake?